1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "base/win/iunknown_impl.h" 6 7 namespace base { 8 namespace win { 9 10 IUnknownImpl::IUnknownImpl() 11 : ref_count_(0) { 12 } 13 14 IUnknownImpl::~IUnknownImpl() { 15 } 16 17 ULONG STDMETHODCALLTYPE IUnknownImpl::AddRef() { 18 base::AtomicRefCountInc(&ref_count_); 19 return 1; 20 } 21 22 ULONG STDMETHODCALLTYPE IUnknownImpl::Release() { 23 if (!base::AtomicRefCountDec(&ref_count_)) { 24 delete this; 25 return 0; 26 } 27 return 1; 28 } 29 30 STDMETHODIMP IUnknownImpl::QueryInterface(REFIID riid, void** ppv) { 31 if (riid == IID_IUnknown) { 32 *ppv = static_cast<IUnknown*>(this); 33 AddRef(); 34 return S_OK; 35 } 36 37 *ppv = NULL; 38 return E_NOINTERFACE; 39 } 40 41 } // namespace win 42 } // namespace base 43
